Chronostratigraphic framework for the IODP Expedition 318 cores from the Wilkes Land margin; constraints for paleoceanographic reconstruction

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doi: 10.1029/2012PA002308
Author(s): Tauxe, L.; Stickley, C. E.; Sugisaki, S.; Bijl, P. K.; Bohaty, S. M.; Brinkhuis, H.; Escutia, C.; Flores, J. A.; Houben, A. J. P.; Iwai, M.; Jiménez Espejo, F.; McKay, R.; Passchier, S.; Pross, J.; Riesselman, C. R.; Röhl, U.; Sangiorgi, F.; Welsh, K.; Klaus, A.; Fehr, A.; Bendle, J. A. P.; Dunbar, R.; Gonzàlez, J.; Hayden, T.; Katsuki, K.; Olney, M. P.; Pekar, S. F.; Shrivastava, P. K.; van de Flierdt, T.; Williams, T.; Yamane, M.
Author Affiliation(s): Primary:
Scripps Institution of Oceanography, San Diego, CA, United States
University of Tromso, Norway
Utrecht University, Netherlands
University of Southampton, United Kingdom
Universidad de Granada, Spain
Universidad de Salamanca, Spain
Kochi University, Japan
Victoria University of Wellington, New Zealand
Montclair State University, United States
University of Frankfurt, Germany
U. S. Geological Survey, United States
University of Bremen, Germany
University of Queensland, Australia
Texas A&M University, United States
Rheinisch-Westfaelische Technische Hochschule Aachen, Germany
University of Glasgow, United Kingdom
Stanford University, United States
Western Michigan University, United States
Korea Institute of Geoscience and Mineral Resources, South Korea
University of South Florida, United States
Queens College, United States
Geological Survey of India, India
Imperial College London, United Kingdom
Lamont-Doherty Earth Observatory, United States
University of Tokyo, Japan
Volume Title: Paleoceanography
Source: Paleoceanography, 27(2). Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0883-8305 CODEN: POCGEP
Note: In English. 35 refs.; illus., incl. sketch map
Summary: The Integrated Ocean Drilling Program Expedition 318 to the Wilkes Land margin of Antarctica recovered a sedimentary succession ranging in age from lower Eocene to the Holocene. Excellent stratigraphic control is key to understanding the timing of paleoceanographic events through critical climate intervals. Drill sites recovered the lower and middle Eocene, nearly the entire Oligocene, the Miocene from about 17 Ma, the entire Pliocene and much of the Pleistocene. The paleomagnetic properties are generally suitable for magnetostratigraphic interpretation, with well-behaved demagnetization diagrams, uniform distribution of declinations, and a clear separation into two inclination modes. Although the sequences were discontinuously recovered with many gaps due to coring, and there are hiatuses from sedimentary and tectonic processes, the magnetostratigraphic patterns are in general readily interpretable. Our interpretations are integrated with the diatom, radiolarian, calcareous nannofossils and dinoflagellate cyst (dinocyst) biostratigraphy. The magnetostratigraphy significantly improves the resolution of the chronostratigraphy, particularly in intervals with poor biostratigraphic control. However, Southern Ocean records with reliable magnetostratigraphies are notably scarce, and the data reported here provide an opportunity for improved calibration of the biostratigraphic records. In particular, we provide a rare magnetostratigraphic calibration for dinocyst biostratigraphy in the Paleogene and a substantially improved diatom calibration for the Pliocene. This paper presents the stratigraphic framework for future paleoceanographic proxy records which are being developed for the Wilkes Land margin cores. It further provides tight constraints on the duration of regional hiatuses inferred from seismic surveys of the region.
Year of Publication: 2012
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; 20 Geophysics, Applied; Algae; Anisotropy; Antarctica; Biostratigraphy; Calibration; Cenozoic; Chronostratigraphy; Climate change; Continental margin; Demagnetization; Diatoms; Dinoflagellata; Eocene; Expedition 318; Geophysical methods; Geophysical surveys; Holocene; IODP Site U1359; IODP Site U1361; Integrated Ocean Drilling Program; Invertebrata; Magnetic declination; Magnetic inclination; Magnetic properties; Magnetic susceptibility; Magnetostratigraphy; Marine methods; Microfossils; Nannofossils; Paleo-oceanography; Paleoclimatology; Paleogene; Paleomagnetism; Palynomorphs; Plantae; Protista; Quaternary; Radiolaria; Reconstruction; Seismic methods; Seismic stratigraphy; Southern Ocean; Surveys; Tertiary; Wilkes Land
Coordinates: S663000 S631500 E1440000 E1354500
Record ID: 2013005641
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